[Law Debenture Corporate Services Inc. Copies to: st David T. Zhang, Esq. Approximate date of commencement of proposed sale to the public: From time to time after the effective date of this registration statement. o ý o o o o CALCULATION OF REGISTRATION FEE] [[Letterhead of Rhudd & Associates] November 18, 2009 Sinovac Biotech Ltd. No.39 Shangdi Xi Road, Haidian District, Beijing 100085 People’s Republic of China Dear Sirs, Sinovac Biotech Ltd. (the “Company”) For the purposes of giving this opinion, we have examined and relied upon copies of the following draft documents: (i) the Registration Statement; and (ii) the prospectus (the “Prospectus”) contained] [November 18, 2009 Sinovac Biotech Ltd. No.39 Shangdi Xi Road Haidian District, Beijing 100085 People’s Republic of China Ladies and Gentlemen: Company Securities Registration Statement We have acted as special U.S. counsel to Sinovac Biotech Ltd., a limited liability corporation incorporated in Antigua, West Indies (the “ The facts, as we understand them, and upon which with your permission we] [November 18, 2009 Sinovac Biotech Ltd. No.39 Shangdi Xi Road, Haidian District, Beijing 100085 People’s Republic of China Dear Sirs, Sinovac Biotech Ltd. (the “Company”) For the purposes of giving this opinion, we have examined and relied upon copies of the following draft documents: (i) the Registration Statement; and (ii) the prospectus (the “Prospectus”) contained in the Registration Statement. We] [CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM Vancouver, Canada, November 18, 2009 Chartered Accountants]